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An element ‘P’ which belongs to $13 th$ group of the periodic table and another element ‘Q’ belongs to $16 th$ group. The formula of the compound formed if they react with each other is:

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Important Questions on Separation of Substances

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Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

The cubic unit cell structure of a compound containing cation $M$ and anion $X$ is shown below. When compared to the anion, the cation has smaller ionic radius. Choose the correct statement(s).

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Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

The radius of

K^{+}

133 pm

and that of

{Cl}^{-}

181 pm

. The volume of the unit cell of

KCl

expressed in

10^{- 22} {cm}^{3}

is:

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Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

The contribution to the total current in a semiconductor, due to electrons and holes are

0.75

and

0.25

respectively. The drift velocity of electrons is

\frac{3}{2}

times that of holes at this temperature. Then the ratio between electron concentration and hole concentration is

EASY

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

In the following circuit diagram, the current through the battery is

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Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

The element ‘X’ has an electronic configuration

2, 8, 3 .

Element ‘Y’ has an electronic configuration

2, 8 7

. The chemical formula of the compound formed when they react is

EASY

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

Among the following, which have highest melting point?

EASY

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

The barrier potential of a p-n junction depends on:

(a)

type of semi-conductor material

(b)

amount of doping

(c)

temperature
Which one of the following is correct?

EASY

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

Match the following

List - I List-II
A) Metallic solid I) Carbon tetrachloride
B) Covalent solid II) Calcium fluoride
C) Molecular solid III) Copper
D) Ionic solid IV) Silicon carbide
V) Glass

The correct answer is

HARD

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

Consider an ionic solid

MX

, with

NaCl

structure. Construct a new structure

(Z)

, whose unit cell is constructed from the unit cell of

MX

, following the sequential instructions given below. Neglect the charge balance.

(i)

Remove all the anions

(X)

, except the central one.

(ii)

Replace all the face centered cations

(M)

, by anions

(X)

(iii)

Remove all the corner cations

(M)

(iv)

Replace the central anion

(X)

, with cation

(M)

.

The value of

(\frac{n u m b e r o f a n i o n s}{n u m b e r o f c a t i o n s})

Z

is _____.

EASY

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion

(C a^{2 +})

and fluoride ion

(F^{-})

are

EASY

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

Glass is

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Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

An element X with atomic number

13

combines with another element Y of atomic number

17

. The formula of the compound formed and the nature of the bond will be:

EASY

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

Silicon doped with gallium forms

EASY

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

An intrinsic semiconductor is converted into

n

-type extrinsic semiconductor by doping it with:-

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Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

Which among the following is NOT a polar molecular solid ?

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Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

Which of the following oxides shows electrical properties like metals?

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Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

A compound formed by elements

X

and

Y

crystallises in the cubic structure, where

X

atoms are at the corners of a cube and

Y

atoms are at the centre of the body. The formula of the compounds is

EASY

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

A unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is

HARD

Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

The formulae of an oxide of an element

M

MO

. The formulae of its phosphate is

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Science>Chemistry>Separation of Substances>Formulae of Elements and Compounds

A solution of a substance 'X' is used for whitewashing.

(a) Name the substance 'X' and write its formula.

(b) Write the reaction of the substance with water.

An element ‘P’ which belongs to 13th group of the periodic table and another element ‘Q’ belongs to 16th group. The formula of the compound formed if they react with each other is:

Important Questions on Separation of Substances

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An element ‘P’ which belongs to $13 th$ group of the periodic table and another element ‘Q’ belongs to $16 th$ group. The formula of the compound formed if they react with each other is: